Need FULL disclosure on TH350 to 700R4 swap

[68Timber]

I'm about to order a wicked crate engine. The rear end is going to get 4.10's and an Eaton Posi.

All I know about swapping an R4 for the TH350 is to move the crossmember back on the frame and drill for the new mounts. Shorten the driveshaft. Add a TV cable bracket to the carb and be sure to install the TV cable to specs.

A friend will be the foreman of this project and he's convinced it's not that easy. The first question he threw at me was tranny cooler lines. Never heard it mentioned, but I'd guess they have to be replaced too. He was also concerned about my column 3-speed shifter not working. And he mentioned yokes and spline counts.

I need the full scoop. He's all up to do the job if we know everything that will have to be addressed up front. He's a good bud, but not so much so to do the leg-work. I can put one in my truck. What all will it take?

Thanks,
John